Bench-drill.



P. E. DOUGLASS.

BENCH DRILL. APPLICATION mm mm. 11. um.

LQAifiw mama Jan.22,1918

INVENTOR fczul Jouylas WITNESSES ATTORNEY Pdfillthlf lh li lltdlfl.

PAUL E. DOUGLASS, OF FLINT, MICHIGAN.

BENCH-DRILL.

Application filed January 11, 1917.

To all whom it may concern:

Be it known that 1, PAUL E. Douomss, a citizen or the United States, residing at Flint, in the county of Genesee and State of Michigan, have invented certain new and useful Improvements in Bench-Drills, 01 which the following is a. specification.

This invention relates to bench drills. and more particularly to a power driven drill adapted to be mounted on a bench in the usual manner.

One oi the main objects oi the invention is to provide a drill of the character stated of simple construction and operation in which the pressure exerted on the drill proper is at all tin cs under direct control of the operator. A further object is to pro vide a drill in which the driving power may be quickly and easily controlled the controlling means for the power being mounted on the lever for controlling the pressure exerted on the drill. Further objects will appear from the detailed description.

in the drawings:

Figure 1 is a side perspective view of the drill,

F 2 is a side view taken from the side opposite to Fig. 1

Fig. is a :lragmentary vertical sectional view through the drive gearing, and

Fig. l is a fragm ntary vertical sectional view through the mounting for the drill spindle.

The standard 1 is provided with an inwardly extending foot 2 and a head 3 carried by a hand screw l operative through an arm 5 mounted in spaced relation to the foot 2. This provides means whereby the standard may be secured to a bench or table. The standard is further provided with an outwardly extending arm 6 which carries the usual disk-like table 7. Three spaced arms 8, 9 and 10 are provided at the upper portion of the standard, these arms being in vertical alinement and positioned above the table 7. The arms 8, 9, and 10 are provided at their outer ends with integral collars 11, 12 and 13 respectively.

A drill spindle 14 is slidably mounted through the collars 11, 12 and 13, and is provided at its lower end with a chuck 15 adapted to hold a drill 16 of any suitable type. The upper end portion of spindle 14 extends into a sleeve 17 in which it is rotatably held by a screw 18 threaded through the sleeve and engaging with an annular groove Specification of Letters Patent.

Patented Jan. 223, Milt).

Serial No. 141,853.

19 in the spindle. The sleeve 1? is prmidcd. at its upper end, with two integral spaced cars 20. A lug 21 formed integral with a hand lever is pivotally secured through these ears by a screw the under surface of this lug being of arcuate shape so as to permit movement oi? the hand lever about the screw 23. The inner end oli lever is pivotally secured, as at .24, to the upper end. of a link 25 the lower end of which is pivoted to a lug 26 integral with the stand ard 1. A coil spring 2'? is mounted about the drill spindle 1 t and is conaned between the collar 13 and the lower end of sleeve 1?. This spring acts by expansion to normally hold the drill spindle in raised position. as in Fig. 1 of the drawing. By grasping the handle 28 of lever and pressing down on the same, the drillspindle and cousemientlv the drill 16, will be forced dmvnward toward the plate 7 so as to bring the drill into engagement. with. the work on the table. ll v 'arying the pressure on the lever the pre. sure on the drill may be varied as desired. A hearing ball 29 is interposed between the inner end of sleeve 17 and the upper end of the drill spindle so as to reduce friction to a minimum.

A motor 30 is secured to the arm 10 of standard 1 and extends at right angles thereto. The casing of this motor is provided with an upper arm 31 and a lower arm 32. The arm has a forwardly extending stud 33 on which rotatably mounted the drive gen 84. This gear is provided, at its center. with a concentric drive gear 35 of considerably less diameter than gear St, a suitable gear shitting mechanism indicated gcir orally by 36. being provided for operativelv connecting the drill spindle ll to either one of the gears 3-1- or 35, thus providing a two speed drive. The gear 34: is provided with an integral internal gear 34 This internal. gear meshes with a pinion 37 keyed on the armature shaft 38 of motor 30. This mo tor is adapted to be connected up to a suitable source of electrical energy by means of the wires 89 and 4-0 which are passed through the motor casing. A push button switch 4-1 is mounted in the outer end of handle 28 of lever and is connected in series in the circuit of the motor by means of the loads 42 and 43. By operating the switch ell the current of the motor may be cut oil" as desired, thus providing simple means for controlling the motor, this means being mounted in the handle for controlling the pressure exerted on the drill. By constructing the drill in this manner, and mounting the control switch for the motor in the hand lever, the pressure exerted on the drill, and the operation of the drill, may be controlled with one hand, thus leav-' ing the other hand free to shift the work on table 7 as may be necessary.

It will be evident that there may be slight changes made in the construction and arrangement of the different parts of my invention without departing from the field and scope of the same, and I intend to include all such variations, as fall within the scope of the appended claims, in this application in which a preferred form only of my invention is disclosed.

I Vhat I claim is:

1. In a bench drill, the combination of a standard, a table carried thereby, a rotatably mounted drill spindle carried by the standard and movable toward and away from the table, a hand lever pivotally connected to the standard, a sleeve pivotally secured to the lever and extending about the upper end portion of the drill spindle, an expansion spring mounted about the spindle below the sleeve so as to normally hold the sleeve in raised position, and means for rotating the drill spindle.

In a bench drill, the combination of a standard provided with a plurality of spaced arms, a table carried by the standard beneath said arms, a spindle rotatably mounted in the arms and movable toward and away from the table, a hand lever pivotally connected to the standard, a sleeve pivotally secured to the hand lever and extending about the upper end portion of the spindle, means for rotatably securing the spindle in said sleeve, a coil spring mounted about the spindle and confined between the sleeve and one of the said arms, means for rotating the spindle, and means carried by the hand lever for controlling the operation of the said rotating means.

leer tea 3. In a bench drill, the combination of a standard provided with a plurality of spaced parallel arms, a table carried by the standard beneath said arms, a drill spindle ro tatably mounted in the arms and movable toward and away from the table, a hand lever, a link pivotally secured at one end to the hand lever and at the other end to the standard, a sleeve carried by the hand lever and pivotally secured thereto, said sleeve extending downward about the upper end portion of the drill spindle, means for rotatably securing the drill spindle in the sleeve, an electric motor carried by the standard, driving connections between the motor and the drill spindle, and a control switch carried by the hand lever and interposed in the circuit of said motor.

4C. In a bench drill, the combination of a standard provided with a plurality of spaced parallel arms, a table carried by the standard beneath said arms, a drill spindle rota tably mounted in the arms and movable'toward and away from the table, a hand lever, a link pivotally secured at one end to the hand lever and at the other end to the standard, a sleeve carried by the hand lever and pivotally secured thereto, said sleeve extending downward about the upper end portion of the drill spindle, means for rotatably securing the drill spindle in the sleeve, an electric motor carried by the standard, driving connections between the motor and the drill spindle, a control switch carried by the hand leverand interposed in the circuit of said motor, and a coil spring mounted about the drill spindle and confined between the top-most arm carried by the standard and the sleeve adapted to normally hold the drill spindle in raised position.

In testimony whereof I aflix my signature in presence. of two witnesses.

PAUL E. DOUGLASS.

WVitnesses:

KARL J. DOUGLASS,

GEORGE W. OooK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

